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AD8205:  Single Supply 42 V System Difference Amplifier

The AD8205 is a single-supply difference amplifier for amplify-ing small differential voltages in the presence of large common-mode voltages. The operating input common-mode voltage range extends from −2 V to +65 V. The typical single-supply voltage is 5 V.

The AD8205 is offered in die and packaged form. The operating temperature range for the die is 25°C higher (up to 150°C) than the ...More

AD8205:  Single Supply 42 V System Difference Amplifier

Product Description

The AD8205 is a single-supply difference amplifier for amplify-ing small differential voltages in the presence of large common-mode voltages. The operating input common-mode voltage range extends from −2 V to +65 V. The typical single-supply voltage is 5 V.

The AD8205 is offered in die and packaged form. The operating temperature range for the die is 25°C higher (up to 150°C) than the packaged part to enable the user to apply the AD8205 in high temperature applications.

Excellent dc performance over temperature keeps errors in the measurement loop to a minimum. Offset drift is typically less than 15 μV/°C, and gain drift is typically below 30 ppm/°C.

The output offset can be adjusted from 0.05 V to 4.8 V with a 5 V supply by using the VREF1 and VREF2 pins. With VREF1 attached to the V+ pin, and VREF2 attached to the GND pin, the output is set at half scale. Attaching both pins to GND causes the output to be unipolar, starting near ground. Attaching both pins to V+ causes the output to be unipolar starting near V+. Other offsets can be obtained by applying an external voltage to the VREF1 and VREF2 pins.

Applications
High-side current sensing in:

  • Motor controls
  • Transmission controls
  • Diesel injection controls
  • Engine management
  • Suspension controls
  • Vehicle dynamic controls
  • DC-to-dc converters

RESOURCES & TOOLS

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  • Ideal for current shunt applications
  • High Common-mode voltage range
    −2 V to +65 V operating
    −5 V to +68 V survival
  • Gain = 50
  • Wide operating temperature range
    Die: −40°C to +150°C
    8-lead SOIC: −40°C to +125°C
  • Adjustable offset
  • Available in SOIC and die form
  • EXCELLENT AC AND DC
    PERFORMANCE
    15 µV/°C offset drift
    30 ppm/°C gain drift
    80 dB CMRR dc to 20 kHz
  • Single/Dual Supply: Single
  • Voltage Supply (Vmax) : +5V
  • Gain Setting Method: fixed
  • Gain Range (min to max): 50
  • Bandwidth G=10 (kHz typ): 50kHz
  • CMRR (dB): 78dB
  • Vnoise RTI 1-10 Hz µVp-p : 20µV p-p
  • Temperature Range: -40 to +125
  • Gain Error (%) max: ±1%
  • Supply Current : 2mA
  • Package: Die,SOIC
  • Vosi (µV): 2000µV

Functional Block Diagram for AD8205

AD8205 Diagram
Functional Block Diagram for AD8205

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